Stanisława Janina Tomczyk (c 1885 – 2 April 1975) was a Polish spiritual medium in the early 20th century known for her alleged demonstrations of psychokinesis and psychic photography.

[3] Tomczyk was the subject of experiments conducted in 1908–9 at Wisła, in southern Poland, by the Polish psychologist Julian Ochorowicz.

He conducted psychokinesis experiments with Tomczyk in which she was alleged to have levitated objects without contact, stop the movement of a clock in a glass case, and influence the turn of a roulette wheel.

[2] In 1933, Everard Feilding wrote in a letter to W. B. Yeats stating that Tomczyk "practically remembers nothing of the phenomena reported by Ochorowicz, whom anyhow she absolutely mistrusts as an observer.

In May 1909, Flournoy and his son Henri, Ochorowicz and Professors Édouard Claparède, Cellerier and Batelli held a series of séance experiments with Tomczyk in Geneva.

[7][5] Professor Batelli believed that the movement of objects was fraudulently produced by a hidden hair or thread that was held between her hands.

[9] Tomczyk's levitation of a glass beaker was exposed and replicated in 1910 by the magician William S. Marriott by means of a hidden thread.